How to install EPEL, Remi, and RPM Fusion (one-liners)

While there’s a few articles out there on this, personally I can’t stand the broken links to the release packages. As a SysAdmin, speed is critical. With speed being critical, and all of us having our trusty set of one-liners to shave time off repetitive tasks, I wanted to post an easy method of always grabbing the latest release packages and not having to worry about a new version coming out causing your one-liner to 404 while you’re busy dealing with other fires.